DNS Access

[Mark_Andrews at isc.org]

> Thanks John
> 
> Your comments are very welcome, and I agree with them entirely
> 
> I have read what I guess must be "some" of the DNS RFCs 1034 & 1035
> They explained in my understanding that DNS uses primarily a UDP connection
> but does use a TCP connection when transfering and entire domain.
> 
> It also gave the codes used for the different queries and classes, which I
> kind of understood, but could not grasp hold of how the packet shown ties up
> with a programming language to request the information.
> 
> I'm used to programming  in delphi as follows:
> TCP.Connect
> TCP.Readln (data);
> TCP.WriteLn ("Here is my info");
> TCP.Disconnect;
> 
> So all though I understood they were discribing how the packet must look I
> couldn't grasp how this translates to a programming code as above??
> 
> I could find nothing that would say: (for example)
> To recieve a domain transfer
>   open a TCP connection
>   send a TCP packet xyz,
>   read TCP data until EOF char received???
>   close TCP connection
>   data recived is in format bytes [0..5] record type bytes [6..130]
> information etc...  OR
>    each domain information is on it's own line thus TCP read will read
> multiple lines one per record??
> 
> Not sure if I'm making sense or not, if I'm let me know
> 
> Thanks again
> Barry
> 

	For starters go read RFC 1033, RFC 1034, RFC 1035.  The wire
	protocol is NOT text based.
	
	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org